Initiation of resistant responses in bean by mycelial wall fractions from three races of the bean pathogen Colletotrichum lindemuthianum

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Abstract
Phytoalexin production and browning were elicited in ''Dark Red Kidney'' bean cotyledons by application of mycelial walls isolated from 3 races of C. lindemuthianum. Two races, .alpha. and .delta., were avirulent on this bean cultivar and a 3rd, .beta., was virulent. Heat treatment of aqueous suspensions of the .alpha., .beta. and .delta. mycelial walls released soluble polysaccharides that elicited browning and phytoalexin production on bean cotyledons. These polysaccharides were not adsorbed by anion or cation exchange resins and ranged in size up to at least a MW of 106. The highest MW fractions were predominantly glucans and showed elicitor activity on cotyledons with application of < 10-6 g glucose equivalents. The soluble polysaccharide extracts also possessed minor amounts of sugars which differed among the .alpha., .beta. and .delta. races.

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